n a sudden noisy expulsion of air from the lungs that clears the air passages; a common symptom of upper respiratory infection or bronchitis or pneumonia or tuberculosis
v exhale abruptly, as when one has a chest cold or congestion
v. 咳嗽( cough的第三人称单数 ); （从喉咙或肺中）咳出; （突然）发出刺耳的噪音